Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 512 · 40 questions

The fast method (Casting out nines): Find the nine-check number of each number: add the digits until one digit is left. Do the same sum (× or +) with those digits and shrink the result to one digit too. Shrink the given answer. Different → wrong. Same → it passes the check.

1. 1.Check with nines: 810 + 489 = 1303. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 933 + 216 = 1149. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 49 × 25 = 1225. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 781 + 917 = 1704. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 535 + 177 = 717. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 354 + 655 = 1009. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 68 × 31 = 2110. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 319 + 847 = 1166. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 42 × 97 = 4080. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 279 + 396 = 672. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 57 × 95 = 5413. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 88 × 19 = 1672. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 95 × 20 = 1900. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 29 × 17 = 494. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 643 + 405 = 1048. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 27 × 74 = 1998. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 851 + 540 = 1383. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 27 × 62 = 1675. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 48 × 18 = 869. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 16 × 55 = 872. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 18 × 60 = 1079. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 52 × 53 = 2758. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 931 + 312 = 1243. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 765 + 488 = 1252. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 55 × 47 = 2593. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 61 × 68 = 4147. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 38 × 30 = 1136. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 733 + 707 = 1440. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 552 + 289 = 844. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 305 + 811 = 1116. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 33 × 27 = 897. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 37 × 70 = 2588. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 57 × 18 = 1024. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 803 + 337 = 1140. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 68 × 32 = 2180. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 59 × 63 = 3717. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 93 × 80 = 7440. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 89 × 77 = 6856. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 474 + 966 = 1440. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 355 + 479 = 834. Correct or wrong? (a) wrong (b) correct

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